Invalid seat cushion



FIG. 1 is a front, top and right side perspective view of an invalidseat cushion showing my new design;

FIG. 2 is a top plan view, the bottom being substantially identical;

FIG. 3 is a view like FIG. 1 with the insert removed;

FIG. 4 is a front elevational view with the insert in place;

FIG. 5 is a view like FIG. 3 of a modified form of an invalid seatcushion showing my new design wherein the insert is C-shaped; and

FIG. 6 is a top plan view thereof with the insert in place, the bottombeing substantially identical.

The ornamental design for the invalid seat cushion, as shown anddescribed.